.books .header {
  display: flex;
  margin: 10px 20px;
}

.books .header label {
  font-size: 20px;
  width: 80%;
}

.books .header div img {
  width: 20px;
}

.books .header div {
  margin: 0 5px;
  width: 10%;
  float: right;
}

.books .main {
  display: flex;
  flex-wrap: wrap;
}

.books .main .item {
  width: 30%;
  margin: 10px 1.5%;
}

.books .main .item img,
.books .main .item p {
  margin: 5px 10%;
}

.books .main .item img {
  width: 80%;
}

.books .main .item .jindu {
  color: #999;
  font-size: 12px;
}

.books .mask {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
  background-color: rgba(0, 0, 0, 0.368627450980392);
}

.books .popover {
  position: fixed;
  right: 20px;
  top: 50px;
  border-radius: 2px;
  width: 100px;
  background-color: #fff;
}
.books .popover p{
  margin: 0 5px;
  line-height: 35px;
  border-top: 1px #999 solid;
}
.books .mask .popover .border{
  content: '';
  position: absolute;
  right:18px ;
  top: -30px;
  width: 0;
  height: 0;
  border: 15px solid;
  border-bottom-color:#fff;
  color:transparent;
}